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State why three phase induction motor never runs on synchronous speed.

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State why three phase induction motor never runs on synchronous speed.

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in Electrical Engineering

Three phase induction motor can never run on synchronous speed. Justify.

Three phase induction motor can never run on synchronous speed. Justify.
Answer : A three-phase induction motor cannot run at synchronous speed due to the following reasons: 1. **Rotor and Stator Interaction**: In an induction motor, the rotor is not connected to any ... it were to run at synchronous speed, no relative motion would exist, and no torque could be generated....

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in Electrical Engineering

Define slip and synchronous speed of 3 phase induction motor.

Define slip and synchronous speed of 3 phase induction motor.

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in Electrical Engineering

List the speed control methods of three phase induction motor and explain any one method.

List the speed control methods of three phase induction motor and explain any one method.
Answer : There are several methods to control the speed of a three-phase induction motor. Here are the most commonly used methods: ### 1. **V/f Control (Voltage-to-Frequency Control)** ... the motor's magnetic flux constant, and thus preventing it from overheating and maintaining efficient operation....

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in Electrical Engineering

State working principle of three phase induction motor.

State working principle of three phase induction motor.
Answer : The working principle of a three-phase induction motor is based on the interaction between the rotating magnetic field produced by the stator and the rotor. Here's a simplified explanation of how it ... the magnetic fields of the stator and the rotor creates a torque, causing the rotor to rotate....

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in Electrical Engineering

What happen when Induction motor run at synchronous speed?

What happen when Induction motor run at synchronous speed?
Answer : When an induction motor runs at synchronous speed, it cannot produce any torque. Here's why: 1. **Synchronous Speed**: The synchronous speed is the speed at which the magnetic field of the ... run at synchronous speed under load; it will need a slight slip to produce torque and continue operating....

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in Electrical Engineering

What is the importance of the synchronous speed in the operation of an induction motor?

What is the importance of the synchronous speed in the operation of an induction motor?
Answer : Synchronous speed is crucial for the operation of an induction motor because it helps define the relationship between the motor's rotor and stator magnetic fields. Here's why it matters: ... 's important for efficient operation and torque production, ensuring the motor runs smoothly and effectively....

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in Electrical Engineering

List different starting methods of three phase synchronous motor. Explain any one of them.

List different starting methods of three phase synchronous motor. Explain any one of them.
Answer : There are several methods to start a three-phase synchronous motor, and these methods are used to overcome the challenges of starting synchronous motors, as they require high starting torque. Some ... used because it allows the motor to start smoothly without the need for complex external equipment....

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in Electrical Engineering

What are the basic principles of three phase synchronous motor?

What are the basic principles of three phase synchronous motor?

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in Electrical Engineering

What are the principles of three-phase synchronous motor?

What are the principles of three-phase synchronous motor?
Answer : A three-phase synchronous motor operates on the principle of electromagnetism and the interaction between a rotating magnetic field and a rotor. Here's a breakdown of its key principles: ... motors work in various applications like power generation, pumps, compressors, and industrial machinery....

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in Electrical Engineering

Why is a synchronous motor a constant speed motor?

Why is a synchronous motor a constant speed motor?

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How does a three-phase induction motor work?

How does a three-phase induction motor work?
Answer : A three-phase induction motor is a type of electric motor that works on the principle of electromagnetic induction. Here's how it works step-by-step: ### 1. **Three-Phase Power Supply** ... maintain this interaction and induce current in the rotor. That's how a three-phase induction motor works!...

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in Electrical Engineering

Explain the principle of working of a three-phase induction motor.

Explain the principle of working of a three-phase induction motor.

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in Electrical Engineering

Draw the power flow diagram of three phase induction motor.

Draw the power flow diagram of three phase induction motor.

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in Electrical Engineering

Draw the torque slip characteristics of three phase induction motor.

Draw the torque slip characteristics of three phase induction motor.

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in Electrical Engineering

Three phase induction motor is known as generalized transformer. Justify.

Three phase induction motor is known as generalized transformer. Justify.

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in Electrical Engineering

Draw neat diagram of star-delta starter for three phase induction motor.

Draw neat diagram of star-delta starter for three phase induction motor.

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in Electrical Engineering

Define Rotor frequency and slip of three phase induction motor.

Define Rotor frequency and slip of three phase induction motor.

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in Electrical Engineering

What is the difference between a single-phase and a three-phase induction motor?

What is the difference between a single-phase and a three-phase induction motor?

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in Electrical Engineering

State the function of centrifugal switch in single phase induction motor.

State the function of centrifugal switch in single phase induction motor.

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in Electrical Engineering

State the principle of a 3-phase induction motor.

State the principle of a 3-phase induction motor.
Answer : The principle of a 3-phase induction motor is based on the interaction between the rotating magnetic field produced by the 3-phase supply and the rotor of the motor. Here's how it ... rotor. This interaction between the two magnetic fields causes the rotor to rotate and produce mechanical motion....

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in Electrical Engineering

What is the maximum speed of a synchronous motor?

What is the maximum speed of a synchronous motor?
Answer : The maximum speed of a synchronous motor is determined by its **synchronous speed**. The synchronous speed depends on the frequency of the supply power and the number of poles in the motor. The ... and the motor's pole count, and it doesn't exceed the synchronous speed under normal conditions....

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in Electrical Engineering

What is the speed of a synchronous motor?

What is the speed of a synchronous motor?

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in Electrical Engineering

Why does a single-phase induction motor not self-start?

Why does a single-phase induction motor not self-start?
Answer : A single-phase induction motor does not self-start because the current in the stator windings is sinusoidal and unidirectional when powered by a single-phase supply. Here's a breakdown of why ... start windings or capacitors are disconnected, and the motor runs like a regular single-phase motor....

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in Electrical Engineering

What is the speed variation of the induction motor from no load to full load?

What is the speed variation of the induction motor from no load to full load?

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in Electrical Engineering

How does the frequency of the power supply influence the speed of an induction motor?

How does the frequency of the power supply influence the speed of an induction motor?
Answer : The frequency of the power supply directly affects the speed of an induction motor. Here's how: ### 1. **Synchronous Speed:** The speed of an induction motor is determined by its **synchronous ... terms: **Higher frequency = faster motor speed**, and **Lower frequency = slower motor speed**....

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in Electrical Engineering

How does load affect the speed of an induction motor?

How does load affect the speed of an induction motor?

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in Electrical Engineering

How is the speed of an induction motor controlled?

How is the speed of an induction motor controlled?

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in Electrical Engineering

Explain hunting and phase swinging in synchronous motor.

Explain hunting and phase swinging in synchronous motor.

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in Electrical Engineering

Where is 3 phase synchronous motor used?

Where is 3 phase synchronous motor used?

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What is the construction and working principle of single phase synchronous motor?

What is the construction and working principle of single phase synchronous motor?

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in Electrical Engineering

A three-phase transformer having a line voltage ratio of 0.4 kV/11kV is connected Star/Delta and protective transformers on the 0.4 kV side have a current ratio of 500/5. Calculate the ratio of the protective transformers on the 11 kV side. Draw a neat circuit diagram and indicate the given values at appropriate places.

A three-phase transformer having a line voltage ratio of 0.4 kV/11kV is connected Star/Delta and protective transformers on the 0.4 kV side have a current ratio of 500/5. Calculate the ratio of ... on the 11 kV side. Draw a neat circuit diagram and indicate the given values at appropriate places.

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in Electrical Engineering

A 220V/22kV three-phase transformer is connected in star/delta. The protective transformers on the 220V side have a current ratio of 400/5. Calculate the CT ratio on the 22kV side.

A 220V/22kV three-phase transformer is connected in star/delta. The protective transformers on the 220V side have a current ratio of 400/5. Calculate the CT ratio on the 22kV side.

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in Electrical Engineering

Describe the method of converting a three-phase to a two-phase transformer by neat diagram. State any two applications.

Describe the method of converting a three-phase to a two-phase transformer by neat diagram. State any two applications.

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in Electrical Engineering

State any four advantages of having stationary armature in case of three phase alternator.

State any four advantages of having stationary armature in case of three phase alternator.

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in Electrical Engineering

How does a synchronous motor differ from an induction motor?

How does a synchronous motor differ from an induction motor?

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in Electrical Engineering

Distinguish between an induction motor and a synchronous motor.

Distinguish between an induction motor and a synchronous motor.

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in Electrical Engineering

What is the difference between induction motor and synchronous motor?

What is the difference between induction motor and synchronous motor?

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in Electrical Engineering

DC series motor should never be started at no load. Justify.

DC series motor should never be started at no load. Justify.

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in Electrical Engineering

Explain the effect of variable excitation on the behaviour of synchronous motor under constant load condition.

Explain the effect of variable excitation on the behaviour of synchronous motor under constant load condition.
Answer : The excitation in a synchronous motor refers to the direct current (DC) supplied to its field winding. This excitation determines the strength of the magnetic field produced by the rotor ... in optimizing the motor's performance, especially in power factor correction and reactive power management....

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in Electrical Engineering

State working principle of operation of synchronous motor.

State working principle of operation of synchronous motor.
Answer : A **synchronous motor** operates based on the interaction between the magnetic field of the stator (the stationary part) and the rotor (the rotating part) that is excited by direct ... accurate in applications like clocks, synchronous generators, or in places where precise timing is crucial....

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in Electrical Engineering

Explain hunting in synchronous motor. State its causes and effects.

Explain hunting in synchronous motor. State its causes and effects.

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in Electrical Engineering

State methods of starting of synchronous motor.

State methods of starting of synchronous motor.

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in Electrical Engineering

Compare the MCCB with ELCB on any three points. State the application of the RCBO.

Compare the MCCB with ELCB on any three points. State the application of the RCBO.

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in Electrical Engineering

How do you wire a three-phase motor for industrial applications?

How do you wire a three-phase motor for industrial applications?

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in Electrical Engineering

What is the principle of single phase induction motor?

What is the principle of single phase induction motor?

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in Electrical Engineering

What is the formula for 3-phase induction motor?

What is the formula for 3-phase induction motor?
Answer : For a 3-phase induction motor, there are a few important formulas that relate to its performance. The key formulas are as follows: ### 1. **Synchronous Speed (Ns)** The synchronous ... Watts) These formulas are fundamental for understanding and analyzing the operation of 3-phase induction motors....

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in Electrical Engineering

What is the principle of 3-phase induction motor?

What is the principle of 3-phase induction motor?
Answer : The principle of a **3-phase induction motor** is based on the interaction between a rotating magnetic field and the current induced in the rotor. Here's a simplified explanation of how it works ... less than the synchronous speed, with the **slip** allowing the induction process to keep happening....

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in Electrical Engineering

How does a single-phase induction motor start?

How does a single-phase induction motor start?

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in Electrical Engineering

Explain with a sketch protection of 3-phase induction motor during single phasing.

Explain with a sketch protection of 3-phase induction motor during single phasing.
Answer : ### Protection of a 3-Phase Induction Motor During Single Phasing **Single Phasing** is a condition where one of the three phases (L1, L2, L3) of a 3-phase system fails or gets ... serious harm can occur. This protects the motor windings and ensures the motor runs safely under normal conditions....

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in Electrical Engineering

Explain the activities carried out during weekly maintenance of 3 phase induction motor.

Explain the activities carried out during weekly maintenance of 3 phase induction motor.
Answer : Weekly maintenance of a 3-phase induction motor involves a series of activities to ensure its smooth operation and to prevent potential issues that could lead to costly repairs or downtime. Here's a ... turn into major repairs, ensuring the motor's reliability and reducing downtime in the long run....

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